The Justice Department is expected to announce Monday morning that it will open a civil rights probe into the Chicago Police Department, in the wake of a year-long delay in releasing a video that showed police killing a black teenager.

Attorney General Loretta Lynch is scheduled to speak at 10 a.m. in Washington, D.C., and her department said she would announce a "law enforcement action" related to Chicago.

According to the Chicago Tribune, that action will be a civil rights probe that looks at the use of police force that killed Laquan McDonald, and also oversight of police shootings.

Many have demanded federal intervention after a video was released showing McDonald being shot 16 times. The video seemed to contradict officers' testimony that said McDonald was charging police with a knife.

The video has also raised questions about why it took so long for it to be released to the public. Many have accused Chicago Mayor Rahm Emanuel of keeping the video from being released until he secured another term as governor, and are calling on Emanuel to step down.

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